/Engine/Source/Editor/UnrealEd/Public/Kismet2/KismetDebugUtilities.h
Is the node a valid breakpoint target? (i.e., the node is impure and ended up generating code)
static bool IsBreakpointValid ( const [FBlueprintBreakpoint](API\Editor\UnrealEd\Kismet2\FBlueprintBreakpoint) & Breakpoint )